Circuit Descriptions; Introduction; Adjustment Order **Important - LG 42PG20 Training Manual

CIRCUIT DeSCRIPTIONS

CIRCUIT DeSCRIPTIONS
4

INTRODUCTION

It is critical that the DC Voltage adjustments be checked whenever troubleshooting a
2
problem. Especially when:
1) The SMPS (Switch Mode Power Supply), Y-Sus (Y-Sustain) or Z-Sus (Z-Sustain)
P are replaced.
2) The panel is replaced, since the SMPS does not come with new panel.
3) A picture issue is encountered.
G
2
0
PANEl lAbEl
(1) Model Name
(2) Bar Code
(3) Manufacture No.
(4) Adjusting Voltage DC, Va, Vs
(5) Adjusting Voltage (Set Up/-Vy/Vsc/Ve/Vzb)
(6) Trade name of LG Electronics
(7) Manufactured date (Year/Month)
(8) Warning

ADjUSTMeNT ORDeR **IMPORTANT**

DC vOlTAGE ADJUSTMENTS
• SMPS board: Va Vs (Do SMPS adjustments first)
• Y-Sus board: Adjust Vscan, -Vy
• Y-Sus board: Adjust Zbias
WAvEFORM ADJUSTMENTS
Y-Sus board: Ramp Up, Ramp Down.
Only necessary when:
1) The Y-Sus board is replaced.
2) "Mal-Discharge" problems.
3) Abnormal picture issues.
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PDP Training - Fall 2008
(9) TUV Approval Mark
(10) UL Approval Mark
(1 1) UL Approval No.
(12) Model Name
(13) Max. Watt (Full White)
(14) Max. Volts
(15) Max. Amps
Remember, the Voltage Label MUST be followed,
it is specific to the panel's needs.
Vscan
Set- -VY Ve Z_BIAS
Up
All label references are from a specific panel.
They are not the same for every panel encountered.
42PG20
Manufacturer
Bar Code
Panel
"Rear View"